EP0311217A1 - Machine à imprimer au pochoir rotatif à plusieurs couleurs - Google Patents

Machine à imprimer au pochoir rotatif à plusieurs couleurs Download PDF

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Publication number
EP0311217A1
EP0311217A1 EP88202240A EP88202240A EP0311217A1 EP 0311217 A1 EP0311217 A1 EP 0311217A1 EP 88202240 A EP88202240 A EP 88202240A EP 88202240 A EP88202240 A EP 88202240A EP 0311217 A1 EP0311217 A1 EP 0311217A1
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EP
European Patent Office
Prior art keywords
screen printing
printing machine
belt
stencils
drive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88202240A
Other languages
German (de)
English (en)
Other versions
EP0311217B1 (fr
Inventor
Robert Johann Van Den Berg
Cornelis Anthonius Toonen
Gerardus Hendrikus Van Mondfrans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stork Brabant BV
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Stork Brabant BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from NL8702411A external-priority patent/NL8702411A/nl
Priority claimed from NL8702408A external-priority patent/NL8702408A/nl
Priority claimed from NL8702410A external-priority patent/NL8702410A/nl
Application filed by Stork Brabant BV filed Critical Stork Brabant BV
Priority to AT88202240T priority Critical patent/ATE71879T1/de
Publication of EP0311217A1 publication Critical patent/EP0311217A1/fr
Application granted granted Critical
Publication of EP0311217B1 publication Critical patent/EP0311217B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/34—Screens, Frames; Holders therefor
    • B41F15/38—Screens, Frames; Holders therefor curved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0831—Machines for printing webs
    • B41F15/0836—Machines for printing webs by means of cylindrical screens or screens in the form of endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/16—Printing tables
    • B41F15/18—Supports for workpieces
    • B41F15/24—Supports for workpieces for webs

Definitions

  • the invention relates to a multicolor, rotary screen printing machine comprising a main frame provided with a number of parallel cylinder stencils which are rotatably mounted herein and which are each able to act together with a dye feed device and with a squeegee, further provided with a continuous supporting belt for the formation of a horizon­tal operative path section for the material to be printed, in which the stencils are fitted on both ends in an end ring rotatably supported in an assembly head which forms part of a beam lying transversely above the supporting belt.
  • a device of this type is known in a first embodiment from Netherlands Patents 125.119, 136.019 and 141. 428 and in a more recent embodiment from Netherlands Patents 132.416, 133.143 and 134.267; see also British Patent 1,524,159 and US Patent 3,291,044.
  • a further object of the inventiona is to make it possible to very accurately adjust the position of the supporting belt, not only for a single stencil diameter but for a series of different diameters, as is the case with cylinder stencils of different designs and of different manufacture.
  • transverse beams used in the superstructure described therein each carry one cylin­drical stencil which is held in a fixed position relative to the bridge.
  • the adjustment of the position of the stencil relative to the blanket and to the web of material to be printed is effected by moving the entire bridge with the associated stencil.
  • one end of each beam is fitted on the frame so as to be movable in a horizontal plane.
  • the attachment of the stencil to the beam is effected by means of detachable assembly heads hooked into the beam, one of which is fixed relative to the beam in operation and the other can be moved longitudinally along the beam, by means of, for example, a piston-cylinder device, to enable variations in the length of the stencil to be absorbed and the stencil to be put under tension.
  • a drawback of the known screen printing machine is that each stencil has to be provided with its own transverse beam because the individual adjustment of the position of each stencil would otherwise not be possible.
  • the beams somewhat obstruct the operators view upon the web of material to be printed so that it is difficult to determine whether during operation the print patterns of the various stencils fit together.
  • the beam is movable: as a result the beam can develop play in operation, which makes accurate positioning of the stencils relative to one another very difficult.
  • the invention aims to provide a rotary screen printing machine which is improved relative to the prior art by its simplicity in operation, adjustment and maintenance.
  • These objectives are achieved by a combination of the following structural features: - a single motor positioned outside the main frame, directly driving on intermediate shaft located inside the frame and connected to the stencils and the suppor­ting belt; - guiding devices having common adjusting means for determining the level of the operative path section of the supporting belt; - the transverse beams are fixed upon the main frame and are provided at both ends with two opposite extensions in transverse direction for the mounting of the sten­cils, said extensions comprising adjustable mounting means for accumulating an assembly head.
  • the adjustment operation is greatly simplified when: - the intermediate shaft has a slip-free (formschlüssig) transmission with a stepped variable gear drive for the stencils and with a drive box for the supporting belt; - the exit shaft from the variable gear drive is connec­ted to a common main drive shaft, located in the longitudinal direction of the machine, for the sten­cils, which shaft is coupled via a series of toothed wheels with a planetary driving mechanism to each of the stencils.
  • a slip-free (formschlüssig) transmission with a stepped variable gear drive for the stencils and with a drive box for the supporting belt
  • the exit shaft from the variable gear drive is connec­ted to a common main drive shaft, located in the longitudinal direction of the machine, for the sten­cils, which shaft is coupled via a series of toothed wheels with a planetary driving mechanism to each of the stencils.
  • formschlüssig is an untranslatable term for a fixed positional relationship between two or more elements such that the movement (or shifting) of one element results in an invariable movement or shift, to be predetermined, of the other element of elements.
  • a further advantage is that, by using a planetary driving mechanism in the drive for the stencils, the angular position of each stencil individually can be adjusted even during operation.
  • a rough adjustment can first be obtained and then the fine adjustment.
  • all of the stencils can be positioned in a uniform manner in the machine and the angular position of each stencil can then be adjusted.
  • Both the coarse and the fine adjustment can be carried out by means of the planetary driving mecha­nism.
  • the planetary driving mechanism for each stencil is made up of two coaxial and virtually identical sun wheels which have only one or two teeth difference between them, which two sun wheels mesh with an elastically deformable annular planet wheel, as known per se from NL Patent 140.946.
  • the two sun wheels are incorporated in the drive of the stencil, while the planet ring is connected to an adjusting motor, provided with a pulse counter.
  • the angular position of each stencil can be individually successively coarsely adjusted and then finely adjusted by means of the planetary driving mechanism. The coarse adjustment is effected by using a high revolution in the adjusting motor.
  • the fine adjustment is effected at a low rotation speed and by a stepwise rotation with the aid of the pulse counter.
  • the invention also relates to the stepped variable gear drive from the screen printing machine described above.
  • This variable gear drive is characterized in that the tooting consists of a pinion and a toothed sector engaging in this, the toothed sector of which is attached to a clutch shaft, located in the casing, onto which the shaft arm is attached and onto which, likewise, an assembly lever is pivotably positioned, the pinion being attached to a second shaft, likewise rotatably bearing-mounted in the said lever, of an adjusting motor suspended on this assembly lever is movably connected, via an elastic link, to the frame.
  • a driving mechanism designed in this way is outstandingly suitable for automatic shifting when the said adjusting motors are pre-programmed.
  • an auxiliary motor is present which is connected, via a freewheel clutch, to the exit shaft of the gear drive, which auxiliary motor is designed with a pulsating excitation during shifting to another velocity ratio for synchronizing the sliding claw couplings of the variable gear drive.
  • This auxiliary motor makes engagement of the slidable claw couplings considerably easier.
  • the adjustment means for the guiding devices of the supporting belt consist of a series of cam faces which are coupled together and provided with a common adjustment device, each cam face cooperating with a follower which is directly coupled to a belt guiding device.
  • cam faces makes a very accurate positioning possible with which an accurate adjustment of the position of the horizontal path section of the supporting belt on the diameter of the cylinder stencils used is possible.
  • the contact pressure between the stencils and the supporting belt can be maintained accurately at the desired figure in this manner.
  • a pneumatic lifting device is present according to the invention between each follower allied to a cam face and the associated belt guiding device, which lifting device is constructed with two end positions for raising the belt guiding device to its operating position and lowering said device to a position in which the supporting belt runs free of the stencils.
  • a screen printing machine is characterized in that the ends of each bridge are extended in the transverse direction on either side and in that fasteners for mounting a stencil holder are located in each extension.
  • the screen printing machine 11 positioned in the middle of this figure can form part of a more extensive printing installation which is provided on the left hand side with a stock roll 12 of a web 13 to be printed.
  • This web passes through a schematically indicated inclined collecting tube or temporary buffer 14, which has, at the bottom, a lead through for the web 13.
  • the web then passes a number of guide rollers 15 and a pretreatment device 16 and finally a tension adjuster 17, after which the web 13 enters the screen printing machine 11 via a curved surface 18.
  • This machine is designed with eight rollers so that the web 13 can be printed with eight different colors or color shades.
  • the web 13 passes through a drying device or steamer 19 to fix the colors applied.
  • the web is again fed along a number of guide rollers 15 to be wound, ultimately, on a stock roll 20.
  • the direction of movement of the web 13 is indicated by an arrow P. It should be pointed out that the loops of web shown in the collecting tube 14 are only temporary since the web 13 runs taut through the tube 14 during the actual printing stage, as explained in more detail at the end of this description.
  • Figure 2 shows a more detailed picture of the screen printing machine 11 from Figure 1, whereby it must be pointed out that Figure 1 is a view from the pump side and Figure 2 from precisely the opposite drive side. Therefore, the arrow P in Figure 2 points in the opposite direction to the same arrow P in Figure 1.
  • the machine 11 is constructed of a main frame 21 provided with a number of parallel cylinder stencils 22 which are bearing-mounted herein in a rotatable manner and are provided with a sequence number 1-8 in Figure 2. These stencils can each act in conjunction with a dye feed device (not shown) and with a squeegee (likewise not shown). Devices of this type belong to the state of the art, such as, for example, described in the abovementioned British Patent 1.524.159.
  • the stencils 22 are located above a continuous supporting belt 23 for the material web 13 to be printed.
  • the screen printing machine also contains means, which will be described in more detail below, for driving both the stencils 22 and the supporting belt 23. Furthermo­re, there are means, which will likewise be explained in more detail below, for positioning the individual stencils 22 in order to bring these accurately into rapport with one another.
  • An initial new element from the screen printing machine according to the invention is constituted by the means shown in Figures 3-6 for driving both the stencils 22 and the supporting belt 23.
  • These means are constituted by a single motor 24, which is located outside the main frame 21 and drives an intermediate shaft 26, located inside the frame 21, directly via the belts 25.
  • the motor 24 is provided with a pulley 27 and the intermediate shaft 26 carries a pulley 28 firmly connected thereto.
  • the inter­mediate shaft 26 is supported by two bearings 29 and forms the driven shaft from which both the stencils 22 and the supporting belt 23 are driven at a constant velocity ratio.
  • the intermediate shaft 26 is provided with an initial toothed pulley 30, firmly attached thereto.
  • the coupling between this pulley 31 and the intermediate shaft 26 is effected by means of a magnetic toothed coupling 32, provided with an intermediate disk 33 which can be slid axially.
  • This disk has a slidable spline connection to a hub 34, which is firmly attached to the intermediate shaft 26, but is pressed by several springs against a coupling flange 35.
  • This flange, which is fixed with bolts 36 to the pulley 31, is provided with a similar toothed face of the interme­diate disk 33.
  • the coupling 32 is, finally, also provided with an electro-magnet 38 which can be energized.
  • the two pulleys 30 and 31 are coupled with the interme­diate shaft 26 and the electromagnet 38 is inoperative.
  • the rotation of the intermediate shaft 26 is then transmitted, via the hub 34, the intermediate disk 33, the toothed coupling face 37, the coupling flange 35 and the bolts 36, to the second pulley 31.
  • the pulleys 30 and 31 cooperate with a toothed belt 39 and, respectively, 40 to drive a toothed pulley 41 and, respectively, 42 (see Figures 5 and 6).
  • the aim in using the toothed coupling 32 and the toothed belts 39 and 40 is to obtain a slipfree (formschlüssig) transmission to both the stencils 22 and the supporting belt 23.
  • the pulley 41 is attached to the entry shaft 43 of a stepped variable gear drive 44, which will be described further below (see Figure 13).
  • the pulley 42 is attached to the entry shaft 45 of a drive box 46 for the supporting belt 23; see also the left of Figure 2.
  • the drive box 46 is located on the downstream side of the printing trajectory formed by the stencils 22 indicated by the numbers 1-9 in Figure 2. In this location, the supporting belt 23 is slung around a drive roller 47, which can be seen in Figure 2. In this location, the supporting belt 23 is slung around a drive roller 47, which can be seen in Figure 8, one end not shown of its shaft 50 being self-adjustably mounted in bearings in the main frame 21 and the other end of which is carried by the drive box 46.
  • the drive box 46 is supported in the frame 21, so that it can tilt about a line A-A, transversely on the roller 47 in the main frame 21.
  • the box 46 is fixed on one side only by means of two bolts 48 using a cylindrical bearing 49.
  • the shaft 50 of the drive roller 47 is rigidly coupled with the exit shaft 51 of the drive box 465, a certain self-adjustability of the bearing moun­ting of the drive roller 47 is maintained.
  • the exit shaft 53 of the stepped variable gear drive 44 is connected to a common main drive shaft 54, located in the longitudinal direction of the machine 11, for the stencils 22.
  • the outer ends of each stencil are provided, in a known manner, with an end ring 55, which is rotatably supported in an assembly head 56.
  • the assembly head is detachably located in a beam 57, which is located transversely above the supporting belt 23. This arrangement is described in detail below and also in the related patent application 87.0...(file 87.5079).
  • the continuous main drive shaft 54 for the stencils 22 is provided at the site of each transverse beam 57 with a worm 58 (see Figures 10 and 11) which meshes with a worm wheel 59.
  • This worm wheel 59 is coupled, via a series of toothed wheels 60, shown schematically, with a planetary driving mechanism 61, which, in turn, is connected to a stencil 22.
  • a planetary driving mechanism 61 which, in turn, is connected to a stencil 22.
  • the planetary driving mechanism 61 for each stencil 22 is made up of two coaxial and virtually identical sun wheels 62 and 63, each provided with internal toothing, which differ from one another only in one or two teeth.
  • One sun wheel 63 is coupled to the series of toothed wheels 60 (the driven side) and the other sun wheel 62 is connected to the exit shaft 64.
  • the two sun wheels internally mesh with the outer toothing of an elastically deformable annular planet wheel 65, the inside of which is pressed by two sets of diametrically positioned rollers 66 to engage with the internal toothing of the sun wheels 62 and 63. These rollers 66 are supported and driven via an extra entry shaft 67.
  • the planetary driving mechanism 61 just described is part of the state of the art and is known in the industry under the name "HARMONIC DRIVE" (vide NL Patent 140.946).
  • each planetary driving mechanism 61 is connected via a toothed belt 68 (see Figure 10) to its own adjusting motor 69. Therefore, there are two adjusting motors 69 per transverse beam 57. With each of these motors it is possible to turn the stencil cylinder connected thereto to the right or to the left in order thus to effect the bringing into register of all of the individu­al stencils with the numbers 1-8.
  • Each adjusting motor 69 can be driven at a high speed of revolution for the coarse adjustment of the particular stencil 22, while a fine adjustment is effected at a low speed of revolution of the adjusting motor. It is possible to use a pulse counter to achieve the correct position of the stencil very precisely and, also, to reset to this position with very little loss of time after changing the stencil.
  • the stepped variable gear drive 44 for the stencils 22 consists of eight pairs of toothed wheels 71-78 which engage in one another and are held in a casing 70. One of each pair of toothed wheels is firmly attached to an auxiliary shaft 79. The other toothed wheel belonging to the said pairs of toothed wheels is fitted on a central shaft consisting of three sections 80-82 positioned in line. The toothed wheel belonging to the first pair 71 is firmly attached to section 80 of the central shaft.
  • the toothed wheel belonging to the second pair 72 of toothed wheels can be slid axially along the central section 81, which is provided with key ways, of the central shaft, and is designed with claw couplings 83 and 84 for meshing with, respectively, the first pair 71 of toothed wheels and the third pair 73 of toothed wheels.
  • the other toothed wheels fitted on the central shaft are freely rotatably.
  • three slidable claw couplings 85-87 are fitted on sections 81 and 82 of the central shaft for engaging or disengaging a coupling between the relative toothed wheels and the said sections 81 an d82 of the central shaft.
  • Section 80 of the central shaft forms a whole with the entry shaft 43, while sections 81 and 82 of the central shaft, which are connected to one another, are coupled to the exit shaft 53.
  • the four claw couplings are moved axially with the aid of sliders 88-91 which can be moved along a sliding rod 92.
  • the slider 88 can assume four different positions, while the sliders 89 and 91 can be slid from a central position in which they are ineffective to a left or a right effective position.
  • the slider 90 is movable only from a left ineffective position to a right effective position.
  • the claw couplings 83-87 which are slidable along the spline shaft 81 can be moved, with their associated sliders 88-91, by means of a device shown in Figures 13-16.
  • This consists of a shift arm 93 which is attached to a clutch shaft 94, rotatably fitted in the casing 70. Turning of this clutch shaft 94 is effected with the aid of toothing 95.
  • This consists of a pinion 96 and a toothed sector 97 which engages in this and is firmly attached to the clutch shaft 94.
  • An assembly lever 98 is pivotably mounted on this same shaft 94, while the pinion 96 is attached to a second shaft 99, which is likewise rotatable in the said lever 98.
  • This shaft 99 is the exit shaft from an adjusting motor 100 suspended on the assembly lever 98.
  • An elongated upper section of this assembly lever 98 is movably connected via an elastically springing link 101, to an angular plate 102 which is attached to the frame or casing 70.
  • Each shift arm 93 is provided at its free outer end with a roller 103 which engages in a groove 104 of the particular slider 88-91.
  • auxiliary motor 105 which is connected via a freewheel clutch 106 (see Figure 15) to the exit shaft 53 of the gear drive 44.
  • This connection likewise consists of a toothed belt 107 which is engaged around the toothed pulleys 108 and 109 mounted on the shaft 110 of the auxiliary motor 105 and on the exit shaft 53 respectively.
  • the auxiliary motor 105 is designed with a pulsating excita­tion 111 which is effective during shifting to another velocity ratio within the stepped variable gear drive 44.
  • the pulsating drive of the auxiliary motor 105 promotes the synchronization of the slidable claw couplings 83-87 of the variable gear drive.
  • Each of the eight different transmis­sion ratios from the variable gear drive 44 demands a specific position of each of the claw couplings and therefo­re of each adjusting motor 100.
  • problems can arise by the engagement of the two parts of a claw coupling to be engaged and to avoid these problem elements 96-101 and 105-111 are provi­ded, as explained below.
  • the relevant slider 88 is moved to the left or to the right (in Figure 12) by the operation of the relevant adjusting motor 100. This movement can take place without hindrance and continues until the two toothed wheels of the pair 72 have separated from one another. A further movement of the claw coupling 83 or 84 can take place only when the counter-claws on section 80 of the central shaft or, respectively, associated with the pair 72 of toothed wheels are in the correct position.
  • the relevant adjusting motor 100 causes a rotation of the clutch shaft 94 and thus turning of the shift arm 93 in accordance with the intended final position.
  • the slider 88 is usually immovable for this final stage because the relevant claws are stopped by one another and do not engage.
  • the clutch shaft 94 with the tooted sector 97 is also locked.
  • the pinion 96 of the adjusting motor 100 now has to give way and rolls away along the stationary tooth sector 97. This rolling away is possi­ble because the assembly lever 98 is rotatable around the fixed clutch shaft 94 and can move aside against the elastic force of the springing link 101. In this way the adjusting motor 100 can achieve its intended final position, although the claw coupling has still not engaged.
  • the freewheel clutch 106 ensures that this rotation is not transmitted to the auxiliary motor 105.
  • the available pulsating excitation 111 ensures that the exit shaft 53, and therefore the sections 81, 82 of the central shaft, are always given a little push to promote the engagement of the claws. This engagement is achieved under the influence of the force which is permanently exerted by the deformed link 101.
  • the shift arm 93 turns with the clutch shaft 94, whereby the toothed sector 97 also turns and carries with it the pinion 96 with the assembly lever 98. The deformation of the elastic link 101 is thus cancelled and the shifting of the variable gear drive 44 is complete.
  • Figures 17-19 relate to a detail from the drive of each of the stencils 1-8 from Figure 2.
  • the drive of each stencil is effected via the exit shaft 64 of the planetary driving mechanism 61; see Figure 11.
  • a toothed wheel 112, with which two other coaxial toothed wheels 113 and 114 engage, is attached to this exit shaft 64.
  • These toothed wheels have only one tooth difference between them, the broadest toothed wheel 113 transmitting the drive torque from the toothed wheel 112 to a crown gear 115.
  • This gear is fixed on a sleeve 116 which forms part of the assembly head 56.
  • the narrower toothed wheel 114 has the same external diameter as the toothed wheel 113, but has one tooth more.
  • toothed wheels 113 and 114 These toothed wheels are provided, on the sides which face one another, with an annular layer of friction material 117.
  • the toothed wheel 114 is pressed by means of a spring 118 in the direction of the toothed wheel 113 so that the two friction rings 117 are permanently in contact with one another.
  • the toothed wheels 113 and 114 of this friction brake are bearing-mounted on a shaft stub 128 which is attached to one lug 129 of a sleeve 120, which will be mentioned below.
  • each assembly head 56 is provided with four mountings 121, so that there are also four adjusting nuts 124.
  • Each nut has external toothing 126 which engages with a common toothed belt 127. By operation of this toothed belt, the relevant stencil 22 can be moved axially, i.e. in the widthwise direction relative to the supporting belt 23. A movement of this type is possible because of the presence, on the opposite stencil end (the pump side), of a springing tension device, described in a further portion of this specification.
  • a web of an inexpensive quality (a so-called leader) is first fed through the printing machine 11.
  • the required length of the leader with which the printing machine can be set entirely ready for use is known experimentally.
  • the leader is stored in the temporary buffer or collecting tube 14 and the material actually to be printed (the web 13) is sewn onto the trailing end of the leader.
  • the feed of the web 13 from the roll 12 is determined such that, at the time that the leader/web seam passes through the printing machine 11, the buffer 14 is empty and the web 13, to be printed, is at the correct tension (by means of regulator 17).
  • a new leader is sewn onto the trailing end of the web 13, for which purpose the final section of the web 13 is fed at accelerated speed into the buffer 14.
  • the installation can be stopped and the actual printing (the run) is complete with as little loss as possible of valuable web material.
  • the so-called PICO point i.e. a marker 130 close to the edge of each cylinder stencil 22 (see Figure 18), has been discussed above.
  • the end ring 55 at the drive side of each stencil has a notch 131 located in the same radial surface as the PICO point.
  • the assembly ring 132 of each sleeve 116 is provided with a pin 133 which fits into the notch 131, after which a bayonet ring 134 effects the fixing of the stencil.
  • the PICO point has a fixed position relative to the design on the stencil 22.
  • the assembly ring 132 is also provided with a magnetic block (not shown) which can interact with a sensor (not shown) fitted in the fixed drive casing 123 belonging to the assembly head 56.
  • squeegee construction employed is not specified in this specification.
  • a trailing blade squeegee can be used, but a so-called double bladed slot squeegee is also possible, see US Patent 4,753,163 or a (magnetic) roller squeegee, see the related Patent Application NL 87.02420 (file 886051).
  • each cam face 137 cooperates with a follower 139 device 139 which is directly coupled to a belt guiding device 136.
  • Each cam face 137 consists of the lowermost boundary of a groove 140 in a strip 141. This limitation, i.e. this cam face 137, has a stepwise construction as may be seen in Figures 21 and 23.
  • the strips 141 are coupled together by similar strips 142 (without groove 140) and said coupled strips are mounted so as to be movable in the main frame 21 parallel to the horizontal path section A of the supporting belt 23.
  • This ability to move is made possible by the use of slide guides 143 located opposite each other, whilst the reaction forces operating on the strips 141 and derived from the follower 139 are taken up by a supporting roller 144 fitted vertically under each follow-on device.
  • a pneumatic lifting device 145 is present between each follower 139 cooperating with a cam face 137 and the associ­ated belt guiding device 136 and is constructed with two end positions for raising the belt guiding device 136 to its operating position and lowering said device to a position in which the supporting belt 23 runs free of the stencil 22.
  • the lifting device 145 is constituted by a housing 146 which has a piston 147 and a piston rod 148 functioning as a push rod. Said rod 148 engages a stub axle 149 of the guiding device 136 embodied as a roller.
  • the uppermost operating position of the guiding device 136 is determined by an accurately adjustable screw pin 150 fitted in the upper cover 151 of the housing 146. Raising and lowering of the supporting belt 23 therefore takes place simply by inflow or outflow of pressure medium in the space under the piston 147.
  • each housing 146 The height adjustment of each housing 146 is determined by a strip 152 coupled thereto (see Figure 22). Three strips 152 are connected together by two coupling blocks 153 which can slide along short and firmly fixed vertical rods 154. Four housings 146 of the same number of pneumatic lifting devices 145 are fitted on these three strips 152 (in this embodiment). A follower 139 is attached to each coupling block 153 such that two cam faces 137 always determine the position of four of said lifting devices 145, i.e. of four guiding devices 136.
  • the cam face 137 has a stepwise construction and consists of eight horizontal levels which are connected by means of intermediate sections which slope downwards. Said levels are related to the diameter of the cylinder stencils 22 used. In the position according to Figure 23, the follo­wer 139 cooperates with the lowest cam level which means that the stencils 22 have the largest permissible diameter. By moving the coupled strips 141, 142 with the aid of the adjustment device 138 to be further described below, each follower 139 is raised in a stepwise manner to a subsequent level associated with the use of cylinder stencils with decreasing diameters.
  • the adjustment device 138 for the cam faces 137 is constituted by a screw thread rod 155 lying in line with the coupled strips 141, 142 and which cooperates with a nut device 156 which is rotatably mounted so that it cannot be moved axially in the frame 21.
  • a roller bearing 157 (see Figure 23) is present which can take up both radial forces and some axial load.
  • a set of coupled strips 141, 142 with cam faces 137 is mounted on either side of the machine and a single drive motor 158 is present which cooperates via a toothed belt or chain 159, with the nut device 156 of the thread rod 155 associated with each of the two sets of coupled strips. It is also possible to achieve drive via toothed wheels. It is essential that the two nut devices 156 undergo precisely the same rotation.
  • a strip 160 is present which is connected to the coupled strips 141, 142.
  • Said strip is provided with a number of permanently magnetic pulse emitters 161.
  • the same number of positions of the coupled cam faces 137 can be achieved by relevant control of the drive motor 158 as there are stepped cam positions available in the grooves 140.
  • the user of the printing machine has only to key in a predetermined code whereupon the motor 158 operates until the sensors 162 detect that the cam faces 137 have reached the required position.
  • Figure 27 shows a device for tensioning and slackening the supporting belt 23.
  • the return roller 47′ located near the position at which the web 13 is brought into contact with the belt 23, is supported in a movable manner in the main frame 21 of the machine.
  • Each end of said movable return roller 47′ is connected with a screw rod 163 on which a rotatable but axially non-movable nut device 164 is fitted.
  • a motor drive 165 is located on a lower level, as may be seen in Figure 2.
  • a device 166 for measuring the tensile stress is present in the screw rod 162. This measu­ring device can emit a pulse as soon as the desired tension is reached in the supporting belt 23. Said pulse then switches the motor drive 165 off.
  • the structural embodiment described above makes it possible to achieve virtually all of the operations automa­tically so that the least number of time losses possible occurs, the operating personnel can be limited to a minimum and a very accurate height adjustment of the supporting belt 23 in the path section A can be achieved without human error.
  • FIGS 17, 18, 28 and 29 show the transverse beam 57 and the assembly heads 56 at the drive side of the screen printing machine.
  • the assembly heads are mounted in an extension 123 of the outer end of each transverse beam 57, which is firmly attached to the machine frame 21 and extends transversely over the web to be printed.
  • the nuts 124 are provided with an external toothing 126, which cooperate with a toothed belt 127.
  • This belt is driven by a motor 167.
  • the axis of the motor 167 is located in a plane which runs parallel to that of the belt 127.
  • the motor is connected to a right-angled transmission 168 which has, at its exit shaft, a pinion 169 engaging the belt 127.
  • each of the four mountings 121 is associated to a component 170.
  • the nuts 124 are mounted in the concerning component 170.
  • the two elements 121 and 170 are connected to one another by means of a bush 171, which is provided with a shoulder and is attached to the component 170 by means of a nut.
  • the mounting 121 is pressed against the component 170 by a compression spring 172, one end of which presses directly against the mounting 121 and the other end of which rests against the shoulder of the bush 171.
  • the bush 171 and the nut 124 are mounted on a screwed spindle 173, one end of which is secured in the extension 123.
  • the spindles 173 are held at the end opposite to the extension 123 by a support plate 174 with four lugs, which are attached by means of screws 175 to ribs 175 formed on the extension 123 (vide Figure 29).
  • Such an assembly head 177 is located in an adjusta­ble extension 178 analogous to the fixed extension 123 at the drive side.
  • This head 177 comprises a non-rotatable section 179 and a rotatable sleeve 180 equivalent to sleeve 116 shown in Figure 18.
  • the sleeve 180 is mounted in the other section 179 by means of a bearing 181. It is observed that the sleeve 180 is not provided with a separate drive since the rotation for each stencil 22 is generated in the assembly heads 56 from the - opposite - drive side (vide Figures 18, 19).
  • the section 179 of the assembly head 177 is connected to an intermediate component 182 by means of three pneumatic cylinders 183.
  • the component 182 is self-adjus­tingly attached to the extension 178 via a screw fitted to the free end of the piston rod 184 of the cylinder 183.
  • the non-rotatable section 179 of the assembly head 178 is slidably mounted at 185 in the intermediate component 182.
  • the cylinders 183 are attached to the section 179 of the assembly head 178.
  • the cylinders 178 are connected at 186 by conduits 187 to one another and to a source (not shown) of compressed air, (vide arrow 188).
  • each stencil 22 can directly and concentrically be axially tensioned relative to the intermediate component 182 and thus to its extension 178.
  • the inde­pendent action of each piston-cylinder device will compensa­te for any bending of the assembly head 177.
  • axial adjustment of one end of the stencil 22 is possible by means of the nuts 124 and the spindles 173 (see Figure 18) on the drive side. The other end of the stencil can follow elastically on the pump side.
  • the piston-cylinder devices 183, 184 are then operated such that they move the assembly head 177 in a direction away from the drive side (to the right in Figure 30), so that the stencil is kept under tension and cannot twist as a result of the one-sided drive.
  • the intermediate component 182 can be shifted in horizontal direction along the extension 178 parallel to the direction of travel P shown in Figure 1.
  • the device 189 serving this purpose is shown in Figures 31 and 34.
  • a tubular hub 190 provided with an internal screw thread is mounted within the intermediate component 182 by means of a bearing 191 which on its turn is secured in the intermediate component 182 by means of a retaining ring 192.
  • the internal screw thread of the hub 190 cooperates with a screwed spindle 193 which runs out into a head 194. This head is attached by means of a screw 195 to the extension 178 (not shown in Figure 34).
  • a conical toothed wheel 196 is formed on one end of the hub 190. This wheel 196 engages in a conical toothed wheel 197 which is fixed to the exit shaft 198 of a motor 199. This motor is mounted by means of bolts 200 to the component 182; these bolts at the same time firmly hold a bearing 201 in the component 182.
  • the conical toothed wheels 196 and 197 form a right-angled transmission via which the motor 199 moves the hub 190 along the spindle 98. Consequently the component 182 is shifted relative to the extension 178.
  • This arrangement is advantageous because the space required for the device 189 can thus be kept to a minimum.
  • a toothed wheel 202 is secured by means of a nut 203 to the outer end of the hub 190.
  • This wheel 202 engages in a toothed wheel 204 which is firmly attached to the entry shaft 205 of a potentiometer 206 which serves as the regis­tration device for recording the angular shift the toothed wheel 202 and thus the displacement of the hub 190 and of the component 182.
  • the potentiometer 206 is connected to a known electronic regulating device (not shown) by means of which the motor 199 can be controlled.
  • the displacement of the component 182 gives an equal translatory movement to the concerning assembly head 177. This enables the operator (printer) to bring the stencils 22 exactly in register with each other.
  • the extension 178 on the pump side are attached to the transverse beam 57 by means of a cradle 207 so that they are movable in the longitudinal direction of the beam.
  • the principal component of the cradle is a cradle body 208. As can best be seen in Figure 33, this body rests on a rail 209 which is attached to the transverse beam 57.
  • the cradle body is provided with flanges 210 which hang over the rail 209 and rest against the side edges of this rail.
  • a bolt 210 extending through a thickened section in the center of the cradle body 208 can be attached to the transverse beam 57.
  • the cradle body 208 is provided with a recess 211 on its underside and rests only with edges on the rail 209. As a result of this the requisite surface accuracy for both the underside of the cradle body 208 and the rail 209 is less than would be the case if the cradle body 208 were to rest with a complete base surface on the rail 209. Upstanding strips 212 are attached on either side of the cradle body 208. Hook members 213, by means of which the extension 178 can be slidable suspended from the cradle 207 hang over these strips 212.
  • the cradle body 208 is provided with a cover 214 which is attached by means of a hinge pin 215 to one end of the cradle body 208.
  • the possibilities for moving the assembly heads 177 in longitudinal direction of the stencil and of the beam 57 are as follows.
  • the assembly heads 56 are positively axially movable by means of the nuts 124.
  • the cradle 207 with the two extensions 178 can be shifted over the rail 209 and fixed; the extensions itself can each individually be slid along the upstanding strips 212 of the cradle 207.
  • the assembly heads 178 can be adjusted to the length of the stencils and clearance can be provided for the assembly and dismantling thereof.
  • the piston-­cylinder devices 183-184 hold the stencil 22 under tension in the manner described and passively follow the axial positioning of each stencil from the drive side, so that this positioning can be performed from one side only.
  • the attachment of the end rings 55 of the stencils 22 to the relevant rotatable, tubular sleeve 180 of the assem­bly heads 177 shown in Figure 30 is somewhat different from the structure of Figure 18.
  • the end ring 55 of the stencil 22 is designed for fixing by means of a quarter-turn to the sleeve 180.
  • This ring is detachably secured to the sleeve 180 by means of a bayonet fastening comprising pins 217 which fit in grooves 218 on the outer circumference of the sleeve 180 and can be arrested therein in a known manner.
  • a filling ring 219 prevents the coupling ring 216 from becoming loose from the sleeve 180.
  • a same kind of filling ring is visible in Figure 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
EP88202240A 1987-10-09 1988-10-06 Machine à imprimer au pochoir rotatif à plusieurs couleurs Expired - Lifetime EP0311217B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88202240T ATE71879T1 (de) 1987-10-09 1988-10-06 Mehrfarbenrotationssiebdruckmaschine.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
NL8702411 1987-10-09
NL8702411A NL8702411A (nl) 1987-10-09 1987-10-09 Regelbare bandondersteuning voor een meerkleuren rotatie zeefdrukmachine.
NL8702410 1987-10-09
NL8702408 1987-10-09
NL8702408A NL8702408A (nl) 1987-10-09 1987-10-09 Meerkleuren - rotatie zeefdrukmachine, alsmede getrapt wisseldrijfwerk uit een dergelijke machine.
NL8702410A NL8702410A (nl) 1987-10-09 1987-10-09 Bovenbouw voor een zeefdrukmachine.

Publications (2)

Publication Number Publication Date
EP0311217A1 true EP0311217A1 (fr) 1989-04-12
EP0311217B1 EP0311217B1 (fr) 1992-01-22

Family

ID=27352179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88202240A Expired - Lifetime EP0311217B1 (fr) 1987-10-09 1988-10-06 Machine à imprimer au pochoir rotatif à plusieurs couleurs

Country Status (4)

Country Link
US (1) US4909143A (fr)
EP (1) EP0311217B1 (fr)
JP (1) JPH01135643A (fr)
DE (1) DE3867993D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TR27191A (tr) * 1991-07-05 1994-11-30 Stork Brabant Bv Dönen delikli kaliplarin sürekli birbirine uyduruldugu elekli baski cihazi.
CN103600574A (zh) * 2013-11-06 2014-02-26 常州市高人制辊有限公司 圆网印刷方位调节机构

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Publication number Priority date Publication date Assignee Title
DE4132088C1 (en) * 1991-09-23 1992-10-15 Johannes Klagenfurt Kaernten At Zimmer Mfg. precisely fitting, cylindrical printing stencil - fits end rings to stencil cylinder without notches, providing latter only after adhesive hardening
US5400709A (en) * 1992-09-21 1995-03-28 Comco Machinery, Inc. Rotary print head module and impression bar
JP3418736B2 (ja) * 2000-05-08 2003-06-23 ニュー・クリエイト株式会社 巻出し式スクリーン印刷方法および印刷装置
DE10219845C1 (de) * 2002-05-03 2003-11-20 Koenig & Bauer Ag Siebdruckmaschine und Siebzylinder
DE10300502A1 (de) * 2003-01-08 2004-07-29 Rosenberg Gmbh & Co Druckmaschine und Verfahren zum Bedrucken einer Druckbahn
CN104816536B (zh) * 2015-05-13 2017-06-06 湖州新创丝织品有限公司 一种圆网印花机的圆网头
CN109367215A (zh) * 2018-11-29 2019-02-22 邱凉凉 一种印花机对花装置

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GB358462A (fr) * 1929-04-06 1931-10-05 Zahnradfabrik Aktiengesellschaft
FR763789A (fr) * 1933-11-15 1934-05-07 Appareillage à grand rendement pour l'impression dite lyonnaise des tissus
NL6910511A (fr) * 1969-07-09 1971-01-12
DE2527224A1 (de) * 1974-07-03 1976-01-22 Peter Zimmer Verfahren und einrichtung zum bedrucken endloser warenbahnen
US3995551A (en) * 1973-06-28 1976-12-07 Mitter & Co. Web tensioning and feeding apparatus
NL7610897A (nl) * 1975-10-01 1977-04-05 Zimmer Johannes Drukmachineaandrijving.
DE3435657A1 (de) * 1983-10-06 1985-04-25 Zimmer, Johannes, Klagenfurt, Kärnten Einrichtung zum behandeln, vorzugsweise bedrucken, von warenbahnen mittels zylinderfoermiger vorrichtungen

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US1629564A (en) * 1925-08-03 1927-05-24 White Jessee Mercer Means for preventing backlash in gears
DE1460800B1 (de) * 1963-09-12 1971-01-21 Stork & Co Nv Siebdruckmaschine für Mehrfarbendrucke
NL297818A (fr) * 1963-09-12 1900-01-01
NL141428B (nl) * 1963-09-12 1974-03-15 Stork & Co Nv Zeefdrukmachine.
US3892176A (en) * 1966-02-04 1975-07-01 Konishiroku Photo Ind Rotary screen tensioner for single sided drive
US3420167A (en) * 1967-01-10 1969-01-07 Stork & Co Nv Screen printing machine with driven screen
US3523488A (en) * 1968-11-01 1970-08-11 Usm Corp Fluidic stepping motors
NL6910509A (fr) * 1969-07-09 1971-01-12
US3903792A (en) * 1971-03-17 1975-09-09 Stork Amsterdam Rotary screen printer auxiliary conveyor drive to eliminate creep
JPS4864288A (fr) * 1971-12-15 1973-09-06
NL7314974A (nl) * 1973-10-31 1975-05-02 Stork Brabant Bv Rotatie zeefdrukmachine.
NL7511692A (nl) * 1975-10-03 1977-04-05 Stork Brabant Bv Rotatie-zeefdrukmachine, werkwijze voor het be- drijven van een dergelijke machine, alsmede een hiervoor bestemde registratie-drager.
AT358518B (de) * 1975-10-06 1980-09-10 Zimmer Peter Ag Steuereinrichtung fuer eine rotations- schablonendruckmaschine
NL7801102A (nl) * 1978-01-31 1979-08-02 Stork Brabant Bv Inrichting voor het intermitterend drukken.

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Publication number Priority date Publication date Assignee Title
GB358462A (fr) * 1929-04-06 1931-10-05 Zahnradfabrik Aktiengesellschaft
FR763789A (fr) * 1933-11-15 1934-05-07 Appareillage à grand rendement pour l'impression dite lyonnaise des tissus
NL6910511A (fr) * 1969-07-09 1971-01-12
US3995551A (en) * 1973-06-28 1976-12-07 Mitter & Co. Web tensioning and feeding apparatus
DE2527224A1 (de) * 1974-07-03 1976-01-22 Peter Zimmer Verfahren und einrichtung zum bedrucken endloser warenbahnen
NL7610897A (nl) * 1975-10-01 1977-04-05 Zimmer Johannes Drukmachineaandrijving.
DE3435657A1 (de) * 1983-10-06 1985-04-25 Zimmer, Johannes, Klagenfurt, Kärnten Einrichtung zum behandeln, vorzugsweise bedrucken, von warenbahnen mittels zylinderfoermiger vorrichtungen

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TR27191A (tr) * 1991-07-05 1994-11-30 Stork Brabant Bv Dönen delikli kaliplarin sürekli birbirine uyduruldugu elekli baski cihazi.
CN103600574A (zh) * 2013-11-06 2014-02-26 常州市高人制辊有限公司 圆网印刷方位调节机构

Also Published As

Publication number Publication date
DE3867993D1 (de) 1992-03-05
US4909143A (en) 1990-03-20
EP0311217B1 (fr) 1992-01-22
JPH01135643A (ja) 1989-05-29

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